Locating technology: GPS, GSM/AGPS, Wifi Wristband: Changeable Water resistant: IP65 Communication module: GSM 850/900/1800/1900, GPRS, Bluetooth 4.0 BLE Battery: 300mAh Screen: No display App Support: Android 2.2 and later, IOS 5 and later Standby time: up to 4 days Google Map and built-in Sim card 10 seconds auto recording One button SOS Bluetooth accompanying mode Safe zones setting Package included: Manual, Charging cable, AC adaptor